The Jack-in-the-pulpits are finally making an appearance at Juniper Level. Here’s Arisaema thunbergii in the garden today looking quite enthralling. Arisaema thunbergii is one of the easiest jacks to grow and one that multiplies quite well in the garden. Because arisaemas take several years from seed to flower, when the current flowering-size stock is gone, it won’t be available again until next spring.